arm64: defconfig: Enable more DM/MD targets

Most notably DM_CRYPT for disk encryption but things like snapshot, etc.
are useful on embedded as well and the others make sense on arm64
servers.

Signed-off-by: Guido Günther <guido.gunther@puri.sm>
2 jobs for f/next-20210112/devkit in 28 minutes and 18 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed #318868
librem5
build:aarch64:defconfig

00:26:20

 
  Package
failed #318869
librem5
pkg:aarch64:defconfig

00:01:57

 
Name Stage Failure
failed
pkg:aarch64:defconfig Package
dpkg-buildpackage: info: host architecture arm64
dpkg-source --before-build .
dpkg-checkbuilddeps: error: Unmet build dependencies: rsync kmod cpio
dpkg-buildpackage: warning: build dependencies/conflicts unsatisfied; aborting
dpkg-buildpackage: warning: (Use -d flag to override.)
make[2]: *** [scripts/Makefile.package:83: bindeb-pkg] Error 3
make[1]: *** [Makefile:1547: bindeb-pkg] Error 2
make: *** [Makefile:335: __build_one_by_one] Error 2
ERROR: Job failed: exit code 1